The Tech Page

Jon Stoodley
Jon, a professional writer and tuner, has very kindly stepped up to the plate and answered a lot of trials questions.


1.	How do I bleed stubborn brakes?
2.	How do I clean a carbonized exhaust system?
3.	What do I do if I drown my bike?
4.	How can I make a temporary gasket?
5.	What chain should I use?
6.	Is it necessary to run race gas?
7.	What spark plug should I use?
8.	Unleaded Fuel?
9.	How can I improve brake fade?
10.	What could cause clutch-drag?
11.	Should the fan always be on?
12.	What could cause plug fouling?
13.	What can I do about sticking brakes?
14.	How do I do a Keihin conversion?
15.	How do I remove goo from my exhaust?
16.	Can I buy an oversize piston?
17.	What oil ratio for TX50?
18.	Why is my plug wet?
19.	Altitude jetting for JT25.
20.	TX270 Jetting.
21.	Shock problem.
22.	TXT200 Pre-mix.
23.	Fork Bushes.
24.	TXT280 Suspension set up.
25.	Youth set up.
26.	Reed Valve spacers.
27.	Piston Clearance.
28.	Oil & plug questions.
29.	Routine maintenance.
30.	Routine maintenance-tools.
31.	Low-end-torque tuning.
32.	2001 TXT280 jetting/pipes.
33.	Bad brakes.
34.	Throttle response.
35.	Piston knock.
36.	Starting problems.
37.	Bad crank.
38.	321 Jetting.
39.	Staring problems.
40.	Starting problems II.
41.	Warped reeds.

Jim Snell of TrialsPartsUSA
(Rising Sun Imports) has provided a wealth of information for this site. Jim has given us the official Gas Gas recomendations.


42.	'96 370 Jetting.
43.	Specification sheets.
44.	Steering bearings.
45.	Shifting problems.
46.	Timing.
47.	Brake Fade II.
48.	Carbon Reeds.
49.	'96 JT370 Jetting II.
50.	Gas Gas Bogging.
51.	Coolant Mix.
52.	Dinged Forks.
53.	ATF-oil.
54.	Pampera stalling.
55.	Measuring Pre-mix.
56.	Gearbox Swarf.
57.	Fork Seals.
58.	Depressed Forks.
59.	Warped Head?
60.	Muffler Packing.
61.	Plug Types
62.	Removing Electrics.
63.	Wheel Bearings.
64.	Backfire.
65.	Flushing Coolant.
66.	Compression Loss.
67.	Octane Booster.
68.	Main Bearings.
69.	Bad Reeds
70.	Plastic Paint.
71.	Keihin Carbs.
72.	TX50 Altitude Jetting.
73.	Kickstart Gears.
74.	Bad Coil?
75.	Clutch Nut Torque.
76.	Dot-5 Brake Fluid.
77.	Engine-knock.
78.	Fork Oil Filling.
79.	Octane Booster.
80.	Fan Problem.
81.	Spoke Tightening.
82.	Keihin PWK Question.
83.	Motoplat ignitions.
84.	Anti-freeze leak.

For the latest Gas Gas manuals
(Enduro or Trials) check out:

Gas Gas Spain

Special Articles

TRIALS SUSPENSION TUNING - Jon Stoodley

TIRE CHANGING TIPS - Jon Stoodley

GAS GAS DEL 'ORTO FLOATS - Jim Snell

Jim's Jetting Guidelines

JETTING GUIDELINES FOR MACHINES FROM 1992-2002 - Jim Snell

TXT70 Carburetor setup - Jim Snell (PDF Document)

Wiring Diagrams

Motoplat. '90-'94, All Trials Models

Ducati. '94 JT25, all '95's, most '96's, some '97's. Some Pampera's '96-'98.

Kokusan. '96-2000 Models.

Kokusan. 2000 TXT50.

Kokusan. 2001 TXT models.

Kokusan 2001 TXT80 (Avail as TXT50 in Europe)

Kokusan 2002 TXT-Pro 250/280 Models

Ducati Electronic Ignition - Pro Models 2003/2004

The PRO Clutch

Pro Clutch measurements

Recommendations

Spark Plug	NGKBP5RES, Champion RN11YC, Bosch Platinum WR9DP
Trans/Clutch Oil	Always 5W30 (Not 10W40), 350cc for the Pro, 650cc for other models, normal motor oil (Castrol/Penzoil etc). It is not recommended to use synthetic oil.
Gasoline	95 Octane minimum. No alcohol type blends. (Jim uses Sunoco purple 115 octane 20% to Shell unleaded premium 80%).
Premix	Between 80:1 and 100:1
Brake Fluid	DOT 4 is standard. DOT 5 is fine. (All higher numbers mix with lower numbers).